The Demer in Hasselt
|- location||Limburg, Belgium|
|Length||85 kilometres (53 mi)|
|Progression||Dyle→ Rupel→ Scheldt→ North Sea|
The Demer is an 85-kilometre (53 mi) long river in eastern Belgium, right tributary of the Dijle. It flows through the Belgian provinces Limburg and Flemish Brabant. Its source is near Tongeren. It flows into the river Dijle in Werchter, Rotselaar municipality.
The name "Demer" comes from the Celtic language words "tam" (dark coloured) and "ara" (water) giving rise to a name meaning "dark coloured river".
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